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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">com.google.android.exoplayer2.util</a></div>
<h2 title="Class NalUnitUtil" class="title">Class NalUnitUtil</h2>
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<li>com.google.android.exoplayer2.util.NalUnitUtil</li>
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<pre>public final class <span class="typeNameLabel">NalUnitUtil</span>
extends <a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a></pre>
<div class="block">Utility methods for handling H.264/AVC and H.265/HEVC NAL units.</div>
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<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="NalUnitUtil.PpsData.html" title="class in com.google.android.exoplayer2.util">NalUnitUtil.PpsData</a></span></code></th>
<td class="colLast">
<div class="block">Holds data parsed from a picture parameter set NAL unit.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="NalUnitUtil.SpsData.html" title="class in com.google.android.exoplayer2.util">NalUnitUtil.SpsData</a></span></code></th>
<td class="colLast">
<div class="block">Holds data parsed from a sequence parameter set NAL unit.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Field</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code>static float[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ASPECT_RATIO_IDC_VALUES">ASPECT_RATIO_IDC_VALUES</a></span></code></th>
<td class="colLast">
<div class="block">Aspect ratios indexed by aspect_ratio_idc, in H.264 and H.265 SPSs.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#EXTENDED_SAR">EXTENDED_SAR</a></span></code></th>
<td class="colLast">
<div class="block">Value for aspect_ratio_idc indicating an extended aspect ratio, in H.264 and H.265 SPSs.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static byte[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#NAL_START_CODE">NAL_START_CODE</a></span></code></th>
<td class="colLast">
<div class="block">Four initial bytes that must prefix NAL units for decoding.</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<td class="colFirst"><code>static void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#clearPrefixFlags(boolean%5B%5D)">clearPrefixFlags</a></span>&#8203;(boolean[]&nbsp;prefixFlags)</code></th>
<td class="colLast">
<div class="block">Clears prefix flags, as used by <a href="#findNalUnit(byte%5B%5D,int,int,boolean%5B%5D)"><code>findNalUnit(byte[], int, int, boolean[])</code></a>.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#discardToSps(java.nio.ByteBuffer)">discardToSps</a></span>&#8203;(<a href="https://developer.android.com/reference/java/nio/ByteBuffer.html" title="class or interface in java.nio" class="externalLink" target="_top">ByteBuffer</a>&nbsp;data)</code></th>
<td class="colLast">
<div class="block">Discards data from the buffer up to the first SPS, where <code>data.position()</code> is interpreted
 as the length of the buffer.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#findNalUnit(byte%5B%5D,int,int,boolean%5B%5D)">findNalUnit</a></span>&#8203;(byte[]&nbsp;data,
           int&nbsp;startOffset,
           int&nbsp;endOffset,
           boolean[]&nbsp;prefixFlags)</code></th>
<td class="colLast">
<div class="block">Finds the first NAL unit in <code>data</code>.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getH265NalUnitType(byte%5B%5D,int)">getH265NalUnitType</a></span>&#8203;(byte[]&nbsp;data,
                  int&nbsp;offset)</code></th>
<td class="colLast">
<div class="block">Returns the type of the H.265 NAL unit in <code>data</code> that starts at <code>offset</code>.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getNalUnitType(byte%5B%5D,int)">getNalUnitType</a></span>&#8203;(byte[]&nbsp;data,
              int&nbsp;offset)</code></th>
<td class="colLast">
<div class="block">Returns the type of the NAL unit in <code>data</code> that starts at <code>offset</code>.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isNalUnitSei(java.lang.String,byte)">isNalUnitSei</a></span>&#8203;(<a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink" target="_top">String</a>&nbsp;mimeType,
            byte&nbsp;nalUnitHeaderFirstByte)</code></th>
<td class="colLast">
<div class="block">Returns whether the NAL unit with the specified header contains supplemental enhancement
 information.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>static <a href="NalUnitUtil.PpsData.html" title="class in com.google.android.exoplayer2.util">NalUnitUtil.PpsData</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parsePpsNalUnit(byte%5B%5D,int,int)">parsePpsNalUnit</a></span>&#8203;(byte[]&nbsp;nalData,
               int&nbsp;nalOffset,
               int&nbsp;nalLimit)</code></th>
<td class="colLast">
<div class="block">Parses a PPS NAL unit using the syntax defined in ITU-T Recommendation H.264 (2013) subsection
 7.3.2.2.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>static <a href="NalUnitUtil.SpsData.html" title="class in com.google.android.exoplayer2.util">NalUnitUtil.SpsData</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parseSpsNalUnit(byte%5B%5D,int,int)">parseSpsNalUnit</a></span>&#8203;(byte[]&nbsp;nalData,
               int&nbsp;nalOffset,
               int&nbsp;nalLimit)</code></th>
<td class="colLast">
<div class="block">Parses an SPS NAL unit using the syntax defined in ITU-T Recommendation H.264 (2013) subsection
 7.3.2.1.1.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#unescapeStream(byte%5B%5D,int)">unescapeStream</a></span>&#8203;(byte[]&nbsp;data,
              int&nbsp;limit)</code></th>
<td class="colLast">
<div class="block">Unescapes <code>data</code> up to the specified limit, replacing occurrences of [0, 0, 3] with
 [0, 0].</div>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a></h3>
<code><a href="https://developer.android.com/reference/java/lang/Object.html#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink" target="_top">wait</a></code></li>
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<h4>NAL_START_CODE</h4>
<pre>public static final&nbsp;byte[] NAL_START_CODE</pre>
<div class="block">Four initial bytes that must prefix NAL units for decoding.</div>
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<h4>EXTENDED_SAR</h4>
<pre>public static final&nbsp;int EXTENDED_SAR</pre>
<div class="block">Value for aspect_ratio_idc indicating an extended aspect ratio, in H.264 and H.265 SPSs.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#com.google.android.exoplayer2.util.NalUnitUtil.EXTENDED_SAR">Constant Field Values</a></dd>
</dl>
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<h4>ASPECT_RATIO_IDC_VALUES</h4>
<pre>public static final&nbsp;float[] ASPECT_RATIO_IDC_VALUES</pre>
<div class="block">Aspect ratios indexed by aspect_ratio_idc, in H.264 and H.265 SPSs.</div>
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<pre class="methodSignature">public static&nbsp;int&nbsp;unescapeStream&#8203;(byte[]&nbsp;data,
                                 int&nbsp;limit)</pre>
<div class="block">Unescapes <code>data</code> up to the specified limit, replacing occurrences of [0, 0, 3] with
 [0, 0]. The unescaped data is returned in-place, with the return value indicating its length.
 <p>
 Executions of this method are mutually exclusive, so it should not be called with very large
 buffers.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - The data to unescape.</dd>
<dd><code>limit</code> - The limit (exclusive) of the data to unescape.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The length of the unescaped data.</dd>
</dl>
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<pre class="methodSignature">public static&nbsp;void&nbsp;discardToSps&#8203;(<a href="https://developer.android.com/reference/java/nio/ByteBuffer.html" title="class or interface in java.nio" class="externalLink" target="_top">ByteBuffer</a>&nbsp;data)</pre>
<div class="block">Discards data from the buffer up to the first SPS, where <code>data.position()</code> is interpreted
 as the length of the buffer.
 <p>
 When the method returns, <code>data.position()</code> will contain the new length of the buffer. If
 the buffer is not empty it is guaranteed to start with an SPS.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - Buffer containing start code delimited NAL units.</dd>
</dl>
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<h4>isNalUnitSei</h4>
<pre class="methodSignature">public static&nbsp;boolean&nbsp;isNalUnitSei&#8203;(@Nullable
                                   <a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink" target="_top">String</a>&nbsp;mimeType,
                                   byte&nbsp;nalUnitHeaderFirstByte)</pre>
<div class="block">Returns whether the NAL unit with the specified header contains supplemental enhancement
 information.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mimeType</code> - The sample MIME type, or <code>null</code> if unknown.</dd>
<dd><code>nalUnitHeaderFirstByte</code> - The first byte of nal_unit().</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether the NAL unit with the specified header is an SEI NAL unit. False is returned if
     the <code>MimeType</code> is <code>null</code>.</dd>
</dl>
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<h4>getNalUnitType</h4>
<pre class="methodSignature">public static&nbsp;int&nbsp;getNalUnitType&#8203;(byte[]&nbsp;data,
                                 int&nbsp;offset)</pre>
<div class="block">Returns the type of the NAL unit in <code>data</code> that starts at <code>offset</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - The data to search.</dd>
<dd><code>offset</code> - The start offset of a NAL unit. Must lie between <code>-3</code> (inclusive) and
     <code>data.length - 3</code> (exclusive).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The type of the unit.</dd>
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<h4>getH265NalUnitType</h4>
<pre class="methodSignature">public static&nbsp;int&nbsp;getH265NalUnitType&#8203;(byte[]&nbsp;data,
                                     int&nbsp;offset)</pre>
<div class="block">Returns the type of the H.265 NAL unit in <code>data</code> that starts at <code>offset</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - The data to search.</dd>
<dd><code>offset</code> - The start offset of a NAL unit. Must lie between <code>-3</code> (inclusive) and
     <code>data.length - 3</code> (exclusive).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The type of the unit.</dd>
</dl>
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<h4>parseSpsNalUnit</h4>
<pre class="methodSignature">public static&nbsp;<a href="NalUnitUtil.SpsData.html" title="class in com.google.android.exoplayer2.util">NalUnitUtil.SpsData</a>&nbsp;parseSpsNalUnit&#8203;(byte[]&nbsp;nalData,
                                                  int&nbsp;nalOffset,
                                                  int&nbsp;nalLimit)</pre>
<div class="block">Parses an SPS NAL unit using the syntax defined in ITU-T Recommendation H.264 (2013) subsection
 7.3.2.1.1.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nalData</code> - A buffer containing escaped SPS data.</dd>
<dd><code>nalOffset</code> - The offset of the NAL unit header in <code>nalData</code>.</dd>
<dd><code>nalLimit</code> - The limit of the NAL unit in <code>nalData</code>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A parsed representation of the SPS data.</dd>
</dl>
</li>
</ul>
<a id="parsePpsNalUnit(byte[],int,int)">
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<h4>parsePpsNalUnit</h4>
<pre class="methodSignature">public static&nbsp;<a href="NalUnitUtil.PpsData.html" title="class in com.google.android.exoplayer2.util">NalUnitUtil.PpsData</a>&nbsp;parsePpsNalUnit&#8203;(byte[]&nbsp;nalData,
                                                  int&nbsp;nalOffset,
                                                  int&nbsp;nalLimit)</pre>
<div class="block">Parses a PPS NAL unit using the syntax defined in ITU-T Recommendation H.264 (2013) subsection
 7.3.2.2.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nalData</code> - A buffer containing escaped PPS data.</dd>
<dd><code>nalOffset</code> - The offset of the NAL unit header in <code>nalData</code>.</dd>
<dd><code>nalLimit</code> - The limit of the NAL unit in <code>nalData</code>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A parsed representation of the PPS data.</dd>
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<h4>findNalUnit</h4>
<pre class="methodSignature">public static&nbsp;int&nbsp;findNalUnit&#8203;(byte[]&nbsp;data,
                              int&nbsp;startOffset,
                              int&nbsp;endOffset,
                              boolean[]&nbsp;prefixFlags)</pre>
<div class="block">Finds the first NAL unit in <code>data</code>.
 <p>
 If <code>prefixFlags</code> is null then the first three bytes of a NAL unit must be entirely
 contained within the part of the array being searched in order for it to be found.
 <p>
 When <code>prefixFlags</code> is non-null, this method supports finding NAL units whose first four
 bytes span <code>data</code> arrays passed to successive calls. To use this feature, pass the same
 <code>prefixFlags</code> parameter to successive calls. State maintained in this parameter enables
 the detection of such NAL units. Note that when using this feature, the return value may be 3,
 2 or 1 less than <code>startOffset</code>, to indicate a NAL unit starting 3, 2 or 1 bytes before
 the first byte in the current array.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - The data to search.</dd>
<dd><code>startOffset</code> - The offset (inclusive) in the data to start the search.</dd>
<dd><code>endOffset</code> - The offset (exclusive) in the data to end the search.</dd>
<dd><code>prefixFlags</code> - A boolean array whose first three elements are used to store the state
     required to detect NAL units where the NAL unit prefix spans array boundaries. The array
     must be at least 3 elements long.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The offset of the NAL unit, or <code>endOffset</code> if a NAL unit was not found.</dd>
</dl>
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<h4>clearPrefixFlags</h4>
<pre class="methodSignature">public static&nbsp;void&nbsp;clearPrefixFlags&#8203;(boolean[]&nbsp;prefixFlags)</pre>
<div class="block">Clears prefix flags, as used by <a href="#findNalUnit(byte%5B%5D,int,int,boolean%5B%5D)"><code>findNalUnit(byte[], int, int, boolean[])</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>prefixFlags</code> - The flags to clear.</dd>
</dl>
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